KR101183871B1 - Grinding Machine for External Screw - Google Patents

Abstract

The present invention provides a grinding machine capable of removing a male thread incomplete thread. Here, the grinding machine maintains the chucking state of the chucking pin for chucking the external thread from the feeding position to the transfer disc by the elastic member (coil spring), and then the supply position and the discharge position side according to the rotational movement of the transfer disc. If the position is located in the temporary temporary dechucking (dechucking), it is characterized in that the supply disk is in a state capable of receiving the male screw from the supply position, and in the discharge position is a state capable of dropping the received male screw.

Description

Grinding Machine for External Threads {Grinding Machine for External Screw}

The present invention relates to a grinding machine capable of removing machining on incomplete threads of male threads.

In general, in order to manufacture a male screw, a thread is formed on the surface of the material by form rolling or cutting, and a rolling die using a rolling die can shorten a machining time rather than cutting using a cutting tool. Since rolled screws have better precision than cutting screws, most of them are rolled.

The roll die comprises a pair of dice, which pair has a thread forming portion. The raw material is sandwiched between a pair of dice, and the pair of dice form threads by the thread forming portion while applying pressure to the sandwiched material.

1 is a front view showing a typical male screw. Referring to FIG. 1, the male thread completed through the rolling step includes a head part 2 and a thread part 4, and since the front end side of the thread part 4 is incomplete in thread shape, the thread part 4 is a complete thread part (complete). thread 4c and an incomplete thread 4i having a relatively small diameter D2. In Fig. 1, reference numeral D1 denotes the diameter of the complete screw portion 4c.

However, the male screw as described above has a diameter D2 of the incomplete screw portion 4i on the tip side smaller than that of the complete screw portion 4c, so that the center of the incomplete screw portion 4c enters the female screw even when the center thereof is not in agreement with the female screw and is slightly inclined. Therefore, when fastening by applying a strong force at the moment (see Fig. 2) there was a problem that the screw is poorly fastened with the female screw while entering the inclined state. Such a fastening failure is a problem mainly caused when an automated robot is used for fastening. By removing the incomplete threaded portion 4i at the tip side, the male thread and the female screw are equalized by removing the tip 4c of the threaded portion 4 and the diameter of the tip side. Inconsistent centers can be resolved by preventing the male screw from entering the female screw. For this reason, efforts have been made to effectively manufacture male threads without an incomplete screw portion 4i at the tip side.

An object of the present invention is to provide a grinding machine that can easily remove the incomplete screw portion from the screw portion of the male screw.

According to an embodiment of the present invention, a transfer disk is provided so as to rotate a plurality of transfer grooves to which the male screw supplied from the feeder at the feed position to the discharge position is inserted, and a plurality of transfer grooves into which the male screw from the feeder is inserted; A chucking mechanism for chucking a male screw inserted into the transfer disc; And a grinding wheel to remove the incomplete screw portion at the distal end of the male screw which is chucked to the transfer disc and is transferred to the discharge position, wherein the chucking mechanism is movable back and forth with respect to the transfer groove, and the male screw inserted into the transfer groove when moving forward. A plurality of chucking pins installed on the transfer disc to press the; An elastic member for imparting an elastic force to advance the chucking pins, respectively; There is provided a grinding machine for external thread processing including a chucking pin operating means for reversing the chucking pins located at the supply position side and the discharge position side according to the rotational motion of the transfer disc.

Here, the chucking pin operation means is provided with a plurality of operation members which are respectively installed on the chucking pin and moved with the chucking pin; A supply operation member and a discharge member respectively installed in the peripheral structure so as to contact the operation member installed on the chucking pin located at the supply position side and the discharge position side to reverse the operation member at the supply position side and the discharge position side. It may include an operation member.

The manipulation member may be equipped with a friction reducing member at a portion in contact with the supply and discharge operation members.

The supplying and discharging operation members may have a portion in which a contact surface coming into contact with the operation member retracts the operation member and an inclined portion which guides the operation member to the retraction portion.

The thread from the feeder is inserted into the transfer groove such that its head is located behind the transfer disc and its incomplete screw portion is located in front of the transfer disc, and the chucking pin is rear of the transfer disc. It may be installed so as to press the head of the male screw inserted in the transfer groove is advanced in. At this time, the supply and discharge operation member may be installed to be moved back and forth with respect to the transfer disc to adjust the backward distance of the chucking pin.

According to an embodiment of the present invention, a transfer body for receiving the male screw supplied from the feeder of the supply position and transfer the received male screw to the discharge position while performing a constant movement; A grinding wheel for removing a tip side incomplete screw portion of the male screw conveyed to the discharge position by the transfer body, wherein the male screw from the feeder is received at the transfer body such that the tip side incomplete screw portion is located in front of the transfer body; In addition, the grinding wheel may be provided with a grinding machine for the external thread processing disposed so as to be inclined at a predetermined angle in front of the transfer body.

According to an embodiment of the present invention, a rolling step of providing a male thread by molding a threaded portion of a male thread material; Using a grinding machine as described above, there is provided a male screw manufacturing method comprising a grinding step of removing an incomplete screw portion at the tip side of the male screw by grinding the tip side of the male thread that has undergone the rolling step.

The male screw manufacturing method according to the embodiment of the present invention may further include a polishing step of polishing the male screw subjected to the grinding step.

1 and 2 are a front view and a use state diagram showing a general male screw.
3 is a flow chart illustrating a male screw manufacturing method according to the present invention.
Figure 4 is a front view showing the step-by-step results of the male screw manufacturing method according to the present invention.
Figure 5 is a block diagram showing a grinding machine used in the male screw manufacturing method according to the present invention.
FIG. 6 is a front view of the grinder shown in FIG. 5 seen in the A direction. FIG.
FIG. 7 is an enlarged cross-sectional view of part B of FIG. 5.
FIG. 8 is a front view of the chucking mechanism shown in FIG. 7 seen in the C direction. FIG.
FIG. 9 is a cross-sectional view of the chucking mechanism shown in FIG. 7 seen in the D direction. FIG.
10 is an enlarged view of the grinding wheel shown in FIG. 5.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention. For reference, in describing the present invention, the size of the components shown in the accompanying drawings, the thickness of the line, etc. may be somewhat exaggerated for convenience of understanding. In addition, since terms used in the description of the present invention are defined in consideration of functions in the present invention, they may be changed according to intentions of users, operators, and the like. Therefore, the definition of these terms should be based on the contents throughout the specification.

Figure 3 is a flow chart showing a male screw manufacturing method according to the present invention, Figure 4 is a front view showing a step-by-step results of the manufacturing method, as shown in Figures 3 and 4, the male screw manufacturing method according to the present invention is a male screw. Forging step (S1) for molding the head portion 12 of the head, rolling step (S2) for molding the threaded portion 14 of the male thread, incomplete screw portion 14i at the tip side of the male thread (10) undergoing this rolling step (S2) Grinding step (S3) to remove, including the step (S4) of polishing the surface after the grinding step (S3), look at each step in detail as follows.

1. Forging step (S1)

In the forging step S1, the wire material is supplied to the forging machine, and the wire material is pressurized to form the head 12 of the male screw at one end, and cut to a predetermined length to form the head 12 formed. Provided is a molding material 10-1. (See <A> in FIG. 4)

2. Rolling Stage (S2)

In the rolling step (S2), the male thread 14 is formed on the body of the primary molded material 10-1 in which the head 12 is molded, thereby providing the male thread 10 in which the thread 14 is molded. In this rolling step S2, a rolling die including a pair of dies facing each other and a thread-forming part is provided on each of the opposing portions is used. The primary molding material 10-1 has a body between a pair of dice. Is inserted, and the pair of dice forms the threaded portion 14 by the thread forming portion while applying pressure to the body of the inserted primary molded material 10-1.

The male thread 10 which has undergone such a rolling step (S2) includes a head portion 12 and a threaded portion 14, and the threaded portion 14 is incompletely threaded because the tip side of the threaded portion 14 is incomplete. 14c) and an incomplete screw portion 14i having a relatively small diameter. (See <B> in FIG. 4)

3. Grinding step (S3)

In the grinding step (S3) using a grinding machine, the front end side of the male screw 10 passed through the rolling step (S2) is ground to provide a male screw 10 from which the front end side incomplete screw portion 14i is removed.

The male thread 10 which has undergone such grinding step (S3) has the tip side incomplete threaded portion 14i removed so that the threaded portion 14 is composed of the complete threaded portion 14c, so that the tip side diameters of the threaded portion 14 are the same. Therefore, if the center is inconsistent with the female screw (see <C> in FIG. 4), the female screw may not enter the female screw while entering the inclined state of the female screw while preventing the screw from being poorly coupled with the female screw.

4. Polishing step (S4)

In the polishing step S4, burrs or scales formed on the male thread 10 in the forging, rolling, and grinding steps S1, S2, and S3 are removed, and an oxide layer formed on the surface during heating, such as heat treatment of the material. And gloss treatment. In the polishing step S4, a polishing machine including a pair of turrets facing each other, a plurality of barrels, and driving means for rotating the turrets and barrels, respectively, is used. At the same time as it is rotatable with the turret, it is rotatably installed, and the two drive means rotate the turret and the barrel in opposite directions.

Therefore, after the abrasive stone is put into the barrel together with the external thread 10 which has undergone the grinding step (S3) (water or chemicals can be added together), and the two driving means are operated, the barrel is rotated as the turret rotates. Rotating around the axis of the shaft itself, the counterclockwise rotation itself, the male screw 10 put into the barrel is machined to clean and beautiful surface by friction generated while mixing or colliding with the abrasive stone.

5 to 10 shows a grinding machine used in the grinding step (S3), look at the grinding machine used in this grinding step (S3) with reference to Figures 5 to 10 as follows. For reference, in the following description of the grinding machine, the male screw refers to the one that passed through the rolling step (S2), unless otherwise specified, and for convenience of description, the description of the reference numerals related to the male screw is omitted.

In the male screw manufacturing method according to the present invention, the grinding machine used in the grinding step (S3) receives the male screw supplied from the male screw supply device 30 at the male screw supply device 30, the supply position (P1) to provide the male thread. Male screw feed device 40 to be transferred to the discharge position (P2), the end portion of the male screw conveyed to the discharge position (P2) by the male screw feed device 40 by grinding the incomplete screw portion of the tip side of the male screw (Fig. 4 A removal processing device 50 for removing the reference numeral 14i), and a processing fluid supply device 60 for providing a processing oil required for processing by the removal processing device 50. Here, the male screw feeder 40 and the removal processing device 50 are disposed left and right to face each other.

The male screw feeder 30 includes a ball feeder (not shown) and a linear feeder 310 which sequentially arranges the male threads from the ball feeder one by one in a row, and feeds the male screw. The device 40 has a transfer disc 420 which makes a rotational movement for transfer to the discharge position P2 with respect to the male thread from this line feeder 310 and a male screw from the line feeder 310 to the transfer disc 420. And chucking mechanisms 440 and 450 for chucking / dechucking.

The transfer disk 420 has a central portion mounted on the rotation shaft 410. The rotating shaft 410 is installed in the transfer device body 405 in the left and right direction so that the transfer disc 420 faces the removal processing device 50, and is rotated by the shaft drive means 430. The conveying device body 405 is installed to be movable back and forth and left and right on the base 20 by a movable means such as a slide mechanism, and the distance between the removal processing device 50 and the conveying disk 420 is this conveying device. Moving the body 405 from side to side changes it. The shaft drive means 430 includes a motor 432 and a gear type electric mechanism 434, the rotary shaft 410 is rotated by receiving the rotational force of the motor 432 through the electric mechanism 434, the transfer disc ( The 420 is rotated together with the rotation shaft 410 to perform a rotational movement about an axis in the left and right directions.

On the outer circumference of the transfer disc 420 is provided a plurality of transfer grooves 422 into which one male screw from the line feeder 310 is inserted one by one, and a plurality of transfer grooves 422 are arranged in the circumferential direction of the transfer disc 420. Are spaced apart from each other at regular intervals. Each transfer groove 422 is opened so that two portions facing the front and rear sides of the transfer disc 420 are opened and have a front opening and a rear opening.

According to the transfer groove 422, the transfer disc 420 has a gear structure. The line feeder 310 is installed so as to be positioned above the transfer disc 420, and its end is located on the outer circumferential side of the transfer disc 420, so that the supply position P1 is at the end side of the line feeder 310. The feed groove 422 located at the supply position P1 side according to the rotational movement of the transfer disk 420 of the plurality of transfer grooves 422 through the inlet of the transfer groove 422 (line feeder) Male thread from 310 is inserted.

The male thread from the line feeder 310 has a head (see reference numeral 12 in FIG. 4) located at the rear of the transfer disc 420, and the incomplete screw portion at the tip side is transferred from the front opening of the transfer groove 422 to the transfer disc 420. The screw portion (see reference numeral 14 of FIG. 4) is inserted into the feed groove 422 so as to protrude forward. Preferably, the feed groove 422 is formed to have a size corresponding to the threaded portion of the male screw inserted in this way.

The chucking mechanisms 440 and 450 include a chucking pin assembly 440 made of a chucking pin 442, a pin housing 444, an elastic member 446, and the like. The chucking pin assembly 440 is provided with a plurality of chucking for the male screw inserted into the transfer groove 422, respectively.

The chucking pin 442 penetrates and slides into the pin housing 444 and engages with the pin housing 444. The pin housing 444 has a structure capable of exposing both ends of the chucking pin 442 to protrude outward. The elastic member 446 imparts elastic force so that the chucking pin 442 is moved to the front end side of the chucking pin 442. Here, the chucking pin 442 may be limited by the stopper the moving distance for the purpose of prevention of separation. As the elastic member 446, a coil spring was applied. The coil spring is positioned in the pin housing 444 in a state of being fitted around the chucking pin 442, one end of which is supported by a jaw provided in the chucking pin 442 and the other to the pin housing 444. Supported.

The plurality of chucking pin assemblies 440 configured as described above are pins of the chucking pins 442 by fastening means such as bolts on the rear surface of the transfer disc 420 so that the front end faces the rear opening of the transfer groove 422. The housing 444 is fastened to be disposed at regular intervals along the circumference of the transfer disc 420 and rotate together with the transfer disc 420 similarly to the transfer groove 422. According to the installation structure of the chucking pin assembly 440, the chucking pin 442 moves back and forth with respect to the rear opening of the conveying groove 422, and is advanced to the conveying groove 422 by the elastic member 446 and conveyed. A tip is approached or maintained in the groove 422.

The chucking mechanisms 440 and 450 also reversely face the chucking pins 442 of the chucking pin assembly 440 located at the supply position P1 side and the discharge position P2 side according to the rotational movement of the transfer disc 420. It further comprises a chucking pin operation means 450 which is temporarily spaced apart from the transfer groove 422, the chucking pin operation means 450 is installed at the rear end of each chucking pin 442 together with the transfer disc 420 A plurality of rotated member 452, the chucking pin 442 of the chucking pin 442 located on the supply position (P1) side in contact with the chucking pin 442 of the supply position (P1) side to reverse Discharge operation for reversing the chucking pin 442 at the discharge position P2 side by contacting the operation member 452 of the chucking pin 442 located at the supply operation member 454 and the discharge position P2 side. Member 456.

A bracket 451 is used to install the member 452, which is mounted to the rear end of each chucking pin 442 and extends in the backward direction of the chucking pin 442. It has a horizontal part. The member to be operated 452 is mounted on the horizontal end side of the bracket 451 so that its end faces the rotation shaft 310. Preferably, the plurality of manipulated members 452 are mounted to be radially disposed about the rotation axis 310.

The supply operation member 454 is disposed between the operation member 452 located at the supply position P1 side and the transfer disc 420 of the plurality of operation members 452 and is operated on the supply position P1 side. It is installed on the transfer device body 405 by the left and right movable means 455 so as to be able to move back and forth with respect to the operation member 452. The chucking pin 442 backward distance by the supply operation member 454 is a supply operation member. Moving 454 changes it.

The left and right movable means 455 is a movable member connected to the operation member 454 for supply, an adjusting bolt coupled to the movable member so as to be rotatable, and a fixing member coupled to the adjusting bolt and mounted on the transfer apparatus body 405. It may include. Since the movable member moves in the same direction as the adjusting bolt when the left and right movable means 455 rotates the adjusting bolt, the supply operation member 454 is also moved together with the movable member.

The member to be operated 452 is equipped with a friction reducing member 453 that reduces friction at portions in contact with the supply and discharge operation members 454 and 456, respectively. As the friction reducing member 453, a roller or a wheel may be applied. The supplying operation member 454 has a contact surface in contact with the friction reducing member 453. The contact surface of the supplying operation member 454 is connected to the flat portion 454a and the flat portion 454a integrally. Two inclined portions 454b. Here, one of the two inclined portions 454b is inclined uphill toward the flat portion 454a so that the friction reducing member 453 is guided toward the flat portion 454a so that the chucking pin 442 at the supply position P1 is reversed. And the other is inclined downhill from the flat portion 454a to induce the reversed chucking pin 442 to be advanced slowly. In other words, the inclined portions 454b are positioned on both sides of the flat portion 454a and are formed so as to slope downhill from the flat portion 454a in both directions of the flat portion 454a.

Since the discharge operation member 456 differs only in that it is disposed between the operation member 452 and the transfer disc 420 on the discharge position P2 side as compared with the supply operation member 454, a detailed description thereof. Is omitted.

The removal processing device 50 includes a grinding wheel 520 facing the transfer disc 420, which is equipped with a center portion on the grinding wheel 510. The grindstone shaft 510 is rotatably installed on the body (not shown) of the removal processing apparatus 50, while being rotated at high speed by a grindstone shaft driving means (not shown) including a motor. Like the feeder body 405, the body of the removal processing apparatus 50 is also installed on the base 20 so as to be movable back and forth and left and right by a movable means such as a slide mechanism. Preferably, the grindstone shaft 510 is installed so that the grinding grindstone 520 is inclined at a predetermined angle α, that is, 0.01 to 3 degrees to the rear with respect to the transfer disc 420, more preferably 0.05 to 0.2 degrees. It is installed so that it is inclined.

The processing fluid supply device 60 includes a processing fluid nozzle 610, which is processed from a processing fluid tank (not shown) toward the male thread side which is ground by the grinding wheel 520. Spray the emulsion.

The grinding machine constructed as described operates as follows.

The shaft drive means 430 is operated to rotate the transfer disc 420, and the male screw supply device 30 is operated to supply the male screw. Then, the operation member 452 positioned at the supply position P1 side according to the rotational movement of the transfer disk 420 is pushed in the backward direction of the chucking pin 442 while being in contact with the contact surface of the supply operation member 454. The chucking pin 442 provided with the operation member 452 is spaced backward from the opposing transfer groove 422 while overcoming the elastic force of the elastic member 444, and the male screw from the line feeder 310 is reversed. The thread is inserted into the transfer groove 422 such that the head is positioned between the chucking pin 442 and the transfer disc 420. At this time, the chucking pin 442 at the supply position P1 side is brought into contact with the operation member 452 and the supply operation member 454 through the friction reducing member 453, and Since the contact surface has an inclined portion 454b, it is naturally reversed.

Next, when the contact member 452 on the supply position P1 is released from the supply position P1 according to the rotational movement of the transfer disc 420, and the contact with the supply operation member 454 is released, the chucking is reversed. The pin 442 is advanced by the restoring force of the elastic member 444. In this process, the chucking pin 442 is advanced slowly by the inclined portion 454b and presses the male screw inserted into the transfer groove 422. At this time, since the tip of the chucking pin 442 is in contact with the head of the male screw, the male screw is chucked in close contact with the rear surface of the transfer disc 420.

The male thread from the line feeder 310 is inserted into the conveying groove 422 and chucked in this manner and conveyed to the discharge position P2.

The body of the removal processing device 50 is moved to the transfer disc 420 to be ground by the grinding wheel 520 in which the distal end portion of the male screw transferred to the discharge position P2 side by the transfer disc 420 is rotated. The grinding wheel 520 is approached. At this time, the male screw conveyed to the discharge position P2 side is removed from the tip side incomplete screw portion. Since the grinding wheel 520 is inclined at a predetermined angle, grinding is performed using more surfaces. Here, grinding with more surfaces means that local wear of the grinding wheel 520 can be prevented.

Next, the male screw from which the tip side incomplete screw portion has been removed is transferred to the discharge position P2, whereby the member 452 installed on the chucking pin 442 for chucking the male screw is positioned at the discharge position P2. . Therefore, the operation member 452 positioned at the discharge position P2 is pushed in the backward direction of the chucking pin 442 while being in contact with the operation member 456 for discharge, and the chucking pin (to which the operation member 452 is installed) 442 is spaced apart from the opposing transfer groove 422. At this time, the chucking of the external thread by the chucking pin 442 is released, and the external thread can be detached from the transfer groove 422.

If the discharge position P2 is the lower side of the transfer disc 420, the male screw located at the discharge position P2 is naturally dropped from the transfer groove 422 during dechucking. Thus, the discharge position (P2) is preferably the lower side of the transfer disc 420. If necessary, the dropping of the external thread may be performed by injecting air using air pressure to induce dropping.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

For example, in the above description, the transfer disc 420 is rotated about an axis in the left and right directions, but the transfer disc 420 may be installed to rotate about an axis in the vertical direction.

In addition, the above-described external thread transfer device 40 is described as transferring the external thread by the transfer disk 420 is a rotational movement, the external thread transfer device 40 to the linear reciprocating motion, instead of the transfer disk 420 A transfer body configured or configured to circulate, such as a conveyor, may be applied.

10: male thread 12: head
14: thread part 14c: full thread part
14i: incomplete thread 20: expectation
30: male screw feeder 420: transfer disc
422: feed groove 442: chucking pin
446: elastic member 450: chucking pin operating means
452: operating member 454: operating member for supply
454a, 454b: contact surface 456: discharge operation member
520: grinding wheel 60: processing oil supply device
P1: Supply Position P2: Discharge Position

Claims (10)

A transfer disc which rotates to transfer the male screw supplied from the feeder at the feed position to the discharge position, and the plurality of transfer grooves into which the male screw from the feeder is inserted are spaced apart from each other along the circumference;
A chucking mechanism for chucking a male screw inserted into the transfer disc;
Grinding grind to remove the incomplete screw portion of the front end side of the male screw chucked to the transfer disk and conveyed to the discharge position,
The chucking mechanism,
A plurality of chucking pins mounted on the transfer disc so as to be movable back and forth with respect to the transfer groove and to press the male screw inserted into the transfer groove when moving forward;
An elastic member for imparting an elastic force to advance the chucking pins, respectively;
And a chucking pin operating means for reversing the chucking pins positioned at the supply position side and the discharge position side according to the rotational motion of the transfer disc. The method according to claim 1, The chucking pin operation means,
A plurality of members to be respectively installed on the chucking pins and moved together with the chucking pins;
A supply operation member which contacts with the operation member of the chucking pin located at the supply position side and reverses the chucking pin at the supply position side;
And a discharge operation member for contacting the operation member of the chucking pin located at the discharge position and reversing the chucking pin at the discharge position. The method according to claim 2,
The operation member is a male thread grinding machine equipped with a friction reducing member at a portion in contact with the supply and discharge operation members. The method according to claim 3,
Each of the supply and discharge operation members has a contact surface in contact with the friction reducing member, the contact surface having a flat portion and two inclined portions integrally connected to both sides of the flat portion. The method according to claim 2,
The thread from the feeder is inserted into the transfer groove such that its head is located behind the transfer disc and its incomplete screw portion is located in front of the transfer disc.
The chucking pin is a grinder for processing a male screw installed to advance the rear of the transfer disk to press the head of the male screw inserted into the transfer groove. The method according to claim 5,
The supplying and discharging operation member is a male thread grinding machine installed to be movable back and forth with respect to the transfer disc to adjust the backward distance of the chucking pin. The method according to claim 1,
The grinding wheel is a male thread grinding machine disposed so as to be inclined at a predetermined angle with respect to the transfer disc. delete delete delete

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